Motor Starter Keeps Tripping

Old 03-23-10, 04:50 PM
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Motor Starter Keeps Tripping

Hi, I'm having trouble with one of our air handlers at work. It has a 5 hp motor and 2 belts. It was running ok for a long time. I just changed the filters and noticed that the belts were worn so I replaced them, as I do on all the other 3 units we have. The fan was running better and actually holding the access door on with the suction from the fan but now after it runs for about a half hour, I have to reset the motor starter, then it runs again for about a half hour or 45 min, then the same thing. Did I change something by replacing the belts? I put the same ones in AP37's. Any suggestions?
Old 03-23-10, 06:14 PM
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Probably need to clean your coil and replace your air filters.

Is your 5hp motor single phase? Unlikely, but if so measure or replace the cap.
Old 03-24-10, 05:16 AM
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Overtightening the belt will cause higher amp draw and possibly premature bearing failure. Not saying this is the case.
You need to have someone check the running amps and compare it to the motor and motor starter heater setting.
You can loosen the belts a little to reduce amperage until you can have the amperage checked.

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